Found in a Popular Electronics from the 90s, this circuit can be adapted to use modern operational amplifiers. The output voltage is the square root of the input voltage.
We found this circuit in an American 1980s documentation. The circuit uses a piezoelectric transducer...
We found this circuit in December 1986, Radio Electronics magazine. It uses 3 inverters and has...
This circuit is from 1997 Linear Technology Applications. The circuit uses common components at...